/*
* MIT License
*
* Copyright (c) 2023 Christian Chapman
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "calc.h"
#include "calc_fns.h"
#define CALC_NAN (0.0/0.0)
/* calc_init
* Initialize calculator
*/
int calc_init(calc_state_t *cs) {
memset(cs->stack, CALC_NAN, N_STACK*sizeof(cs->stack[0]));
cs->s = 0;
cs->mem = 0.0;
return 0;
}
/* calc_input_function
* Try to execute the token as a calculator function
*/
int calc_input_function(calc_state_t *cs, char *token) {
for(uint8_t idx=0; idx<sizeof(calc_dict)/sizeof(calc_dict[0]); idx++) {
for(uint8_t idxn=0; idxn<calc_dict[idx].n_names; idxn++) {
if(0 == strcmp(calc_dict[idx].names[idxn], token)) { // Found a match
return (*calc_dict[idx].fn)(cs); // Run calculator function
}
}
}
return -1; // Unrecognized function name
}
/* calc_input_float
* Read the token as a float.
* For convenience, numerals can be written in binary:
* 0 1 2 3 4 5 6 7 8 9
* . - -. -- -.. -.- --. --- -... -..-
* e t n m d k g o b x
*
* Exponent signs must be entered as "p".
* Decimal place "." can be entered as "h" (code ....)
* Sign "-" can be entered as "Ch digraph" (code ----)
*
* e.g. "4.2e-3" can be entered directly or as "4h2pC3"
* similarly, "0.0042" can be "eheedn"
*/
#define REPCHAR(X,Y) for(idx=0; idx<strlen(token); idx++) \
if(X==token[idx]) token[idx] = Y
int calc_input_float(calc_state_t *cs, char *token) {
uint8_t idx;
REPCHAR('e', '0');
REPCHAR('t', '1');
REPCHAR('n', '2');
REPCHAR('m', '3');
REPCHAR('d', '4');
REPCHAR('k', '5');
REPCHAR('g', '6');
REPCHAR('o', '7');
REPCHAR('b', '8');
REPCHAR('x', '9');
REPCHAR('h', '.');
REPCHAR('C', '-');
REPCHAR('p', 'E');
char *endptr;
double d = calc_strtof(token, &endptr);
if(!endptr || (uint8_t)(endptr-token)<strlen(token)) return -1; // Bad format
if(cs->s >= N_STACK) return -2; // Stack full
cs->stack[cs->s++] = d;
return 0;
}
/* calc_input
* Manipulate the stack using the entered token.
* If the token isn't a calculator function, try to convert it to a number and
* add it to the stack.
*
* Return values:
* 0 if function completed successfully.
* -1 if token isn't a calculator function and couldn't convert to float.
* -2 if stack is too full or too empty
* -3 for something else
*/
int calc_input(calc_state_t *cs, char *token) {
int retval = calc_input_function(cs, token);
if(-1 == retval) retval = calc_input_float(cs, token);
return retval;
}